<!DOCTYPE html><html lang="zh-Hans"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"><meta name="description" content="字符串常用操作"><meta name="keywords" content=""><meta name="author" content="kyren"><meta name="copyright" content="kyren"><title>字符串常用操作 | Kyren's Blog</title><link rel="shortcut icon" href="/melody-favicon.ico"><link rel="stylesheet" href="/css/index.css?version=1.9.0"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/font-awesome@latest/css/font-awesome.min.css?version=1.9.0"><meta name="format-detection" content="telephone=no"><meta http-equiv="x-dns-prefetch-control" content="on"><link rel="dns-prefetch" href="https://cdn.jsdelivr.net"><link rel="dns-prefetch" href="https://hm.baidu.com"><script>var _hmt = _hmt || [];
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<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">NSString *yourString = @&quot;   .@^this text has spaces before and after*&amp; &quot;;</span><br><span class="line">[yourString stringByReplacingOccurrencesOfString:@&quot; &quot; withString:@&quot;&quot;]</span><br></pre></td></tr></table></figure>

<p>2）如果你真的需要删除一组字符（即不仅是空格字符，而是任何空格字符，如空格，制表符，牢不可破的空间等），你可以拆分你的字符串使用<code>whitespaceCharacterSet</code>，然后再加入单词在一个串：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">NSArray* words = [yourString componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];</span><br><span class="line">NSString* nospacestring = [words componentsJoinedByString:@&quot;&quot;];</span><br></pre></td></tr></table></figure>



<p>清除首尾空格(注意：NSCharacterSet<code>只会操作字符串的首尾</code>)</p>
<figure class="highlight objectivec"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)controlCharacterSet;  <span class="comment">//控制符</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)whitespaceCharacterSet; <span class="comment">//空格</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)whitespaceAndNewlineCharacterSet; <span class="comment">//空格和换行</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)decimalDigitCharacterSet; <span class="comment">//小数</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)letterCharacterSet; <span class="comment">//文字</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)lowercaseLetterCharacterSet; <span class="comment">//字母数字</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)uppercaseLetterCharacterSet; <span class="comment">//可分解</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)nonBaseCharacterSet;</span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)alphanumericCharacterSet; <span class="comment">//所有数字和字母(大小写)</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)decomposableCharacterSet;<span class="comment">////0-9的数字</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)illegalCharacterSet; <span class="comment">//非法</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)punctuationCharacterSet; <span class="comment">//标点符号</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)capitalizedLetterCharacterSet; <span class="comment">//大写</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)symbolCharacterSet; <span class="comment">//符号</span></span><br><span class="line">+ (<span class="built_in">NSCharacterSet</span> *)newlineCharacterSet <span class="built_in">NS_AVAILABLE</span>(<span class="number">10</span>_5, <span class="number">2</span>_0); <span class="comment">//换行符</span></span><br></pre></td></tr></table></figure>

<p>字符串操作</p>
<figure class="highlight objectivec"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">NSString</span> *string = <span class="string">@&quot;   .@^this text has spaces before and after*&amp; &quot;</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">/*去除字符串中的空格*/</span></span><br><span class="line"><span class="built_in">NSString</span> *trimmedString = [string stringByTrimmingCharactersInSet:[<span class="built_in">NSCharacterSet</span> whitespaceCharacterSet]];</span><br><span class="line"></span><br><span class="line"><span class="comment">/*去除字符串中的空格和换行*/</span></span><br><span class="line">trimmedString = [trimmedString stringByTrimmingCharactersInSet:[<span class="built_in">NSCharacterSet</span> whitespaceAndNewlineCharacterSet]];</span><br><span class="line"></span><br><span class="line"><span class="comment">/*去除字符串中的标点*/</span></span><br><span class="line">trimmedString = [trimmedString stringByTrimmingCharactersInSet:[<span class="built_in">NSCharacterSet</span> punctuationCharacterSet]];</span><br><span class="line"></span><br><span class="line"><span class="comment">/*去除字符串中的符号*/</span></span><br><span class="line">trimmedString = [trimmedString stringByTrimmingCharactersInSet:[<span class="built_in">NSCharacterSet</span> symbolCharacterSet]];</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/*去除字符串中的所有空格符号*/</span></span><br><span class="line">-(<span class="built_in">NSString</span>*)removeAllWhiteSpace:(<span class="built_in">NSString</span>*)original</span><br><span class="line">&#123;</span><br><span class="line">    <span class="built_in">NSCharacterSet</span> *whitespaces = [<span class="built_in">NSCharacterSet</span> whitespaceAndNewlineCharacterSet];</span><br><span class="line">    <span class="built_in">NSArray</span> *parts = [original componentsSeparatedByCharactersInSet:whitespaces];</span><br><span class="line">    <span class="built_in">NSString</span>* rval = [parts componentsJoinedByString:<span class="string">@&quot;&quot;</span>];</span><br><span class="line">    <span class="keyword">return</span> rval;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><a target="_blank" rel="noopener" href="https://stackoverflow.com/questions/7628470/remove-all-whitespaces-from-nsstring">Remove all whitespaces from NSString</a></p>
<p><a target="_blank" rel="noopener" href="https://www.zybuluo.com/chinese-ppmt/note/609656">https://www.zybuluo.com/chinese-ppmt/note/609656</a></p>
</div></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">kyren</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="http://huluo666.gitee.io/2018/01/11/iOS字符串常用操作/">http://huluo666.gitee.io/2018/01/11/iOS字符串常用操作/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a target="_blank" rel="noopener" href="https://creativecommons.org/licenses/by-nc-sa/4.0/">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="http://huluo666.gitee.io">Kyren's Blog</a>！</span></div></div><div class="post-meta__tag-list"></div><nav id="pagination"><div class="prev-post pull-left"><a href="/2018/01/15/regexConvertTool/"><i class="fa fa-chevron-left">  </i><span>正则表达式转换</span></a></div><div class="next-post pull-right"><a href="/2018/01/08/%20Tinypng%E5%9B%BE%E7%89%87%E5%8E%8B%E7%BC%A9%E8%84%9A%E6%9C%AC/"><span>Tinypng图片压缩脚本</span><i class="fa fa-chevron-right"></i></a></div></nav></div></div><footer><div class="layout" id="footer"><div class="copyright">&copy;2022 By kyren</div><div class="framework-info"><span>驱动 - </span><a target="_blank" rel="noopener" href="http://hexo.io"><span>Hexo</span></a><span class="footer-separator">|</span><span>主题 - </span><a target="_blank" rel="noopener" href="https://github.com/Molunerfinn/hexo-theme-melody"><span>Melody</span></a></div><div class="footer_custom_text">hitokoto</div><div class="busuanzi"><script async src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script><span id="busuanzi_container_page_pv"><i class="fa fa-file"></i><span id="busuanzi_value_page_pv"></span><span></span></span></div></div></footer><i class="fa fa-arrow-up" id="go-up" aria-hidden="true"></i><script src="https://cdn.jsdelivr.net/npm/animejs@latest/lib/anime.min.js"></script><script src="https://cdn.jsdelivr.net/npm/jquery@latest/dist/jquery.min.js"></script><script src="https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.js"></script><script src="https://cdn.jsdelivr.net/npm/velocity-animate@latest/velocity.min.js"></script><script src="https://cdn.jsdelivr.net/npm/velocity-ui-pack@latest/velocity.ui.min.js"></script><script src="/js/utils.js?version=1.9.0"></script><script src="/js/fancybox.js?version=1.9.0"></script><script src="/js/sidebar.js?version=1.9.0"></script><script src="/js/copy.js?version=1.9.0"></script><script src="/js/fireworks.js?version=1.9.0"></script><script src="/js/transition.js?version=1.9.0"></script><script src="/js/scroll.js?version=1.9.0"></script><script src="/js/head.js?version=1.9.0"></script><script src="/js/search/local-search.js"></script><script>if(/Android|webOS|iPhone|iPod|iPad|BlackBerry/i.test(navigator.userAgent)) {
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